Additives used in corundum ceramics technology, which form a liquid phase in firing, are classified. The main principles that should be taken into account in selecting additives to ensure production of high-quality aluminum oxide materials with a decreased sintering temperature are formulated. A series of eutectic systems is proposed, whose introduction in corundum makes it possible to obtain dense ceramic materials at a firing temperature of 1350 – 1550°C. Some sintering specifics of these materials are discussed.